Improvement in printing-telegraphs



T. A. EDISON.

Improvement in Printing-Telegraph's.-

N0.128,604. PatentedJu|y2,1 872.

01/: a N I I THOMAS A. EDISON, OF NEWARK, NEW JERSEY.

IMPROVEMENT IN PRINTlNG- TELEGRAPHS.

Specification forming part of Letters Patent No. 128,604, dated July 2,1872.

To all whom it may concern:

Be it known that I, THOMAS A. EDISON, of Newark, in the county of Essexand State of New Jersey, have invented an Improvement inPrinting-Telegraphs; and the following is declared to be a correctdescription thereof.

This invention relates to combining with the printing-lever anair-cushion that acts as a detainer to the printing mechanism so as toprevent it operating, except after the typewheel has been set by thepulsations in the mainline, and the circuit is kept closed while theair-cushion is sufficiently displaced to permit the impression.

In the drawing, Figure 1 is a plan, and Fig. 2 an elevation, of thisimprovement.

The type-wheel magnet a and printing magnet I) are in the same electriccircuit. The pulsations in the magnet a operate to set the type-wheel eby a step-by-step movement, but they do not move the impression-lever fsufficiently for printing, because the spring 9 is acting upon thesame,and the air-cushion in, the cylinder 70 formed between the piston andfrom the type-wheel.

I claim as my invention The air-cushion applied to and combined with theprinting-lever and its magnet in a printing-telegraph instrument, in themanner and for the purposes specified.

Signed by me this 26th day of April, A. D. 1872.

.T. A. EDISON.

Witnesses Gno. T. PINcKNnY,

Guns. H. SMITH.

